plasma-framework/dataenginemanager.cpp
Aaron J. Seigo 3d51733018 * more api documentation
* changes to reflect api movement

svn path=/trunk/KDE/kdebase/workspace/plasma/lib/; revision=668671
2007-05-27 08:01:31 +00:00

135 lines
3.3 KiB
C++

/*
* Copyright (C) 2006 Aaron Seigo <aseigo@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "dataenginemanager.h"
#include <KDebug>
#include <KServiceTypeTrader>
#include <KParts/ComponentFactory>
namespace Plasma
{
class DataEngineManager::Private
{
public:
Private()
{}
Plasma::DataEngine::Dict m_engines;
};
class DataEngineManagerSingleton
{
public:
DataEngineManager self;
};
K_GLOBAL_STATIC(DataEngineManagerSingleton, privateSelf)
DataEngineManager* DataEngineManager::self()
{
return &privateSelf->self;
}
DataEngineManager::DataEngineManager()
: d(new Private())
{
}
DataEngineManager::~DataEngineManager()
{
foreach (Plasma::DataEngine* engine, d->m_engines) {
delete engine;
}
d->m_engines.clear();
}
Plasma::DataEngine* DataEngineManager::dataEngine(const QString& name) const
{
Plasma::DataEngine::Dict::const_iterator it = d->m_engines.find(name);
if (it != d->m_engines.end()) {
// ref and return the engine
//Plasma::DataEngine *engine = *it;
return *it;
}
return 0;
}
Plasma::DataEngine* DataEngineManager::loadDataEngine(const QString& name)
{
Plasma::DataEngine* engine = dataEngine(name);
if (engine) {
engine->ref();
return engine;
}
// load the engine, add it to the engines
QString constraint = QString("[X-EngineName] == '%1'").arg(name);
KService::List offers = KServiceTypeTrader::self()->query("Plasma/DataEngine",
constraint);
if (offers.isEmpty()) {
kDebug() << "offers are empty for " << name << " with constraint " << constraint << endl;
return 0;
}
engine = KService::createInstance<Plasma::DataEngine>(offers.first(), 0);
if (!engine) {
kDebug() << "Couldn't load engine \"" << name << "\"!" << endl;
return 0;
}
engine->ref();
engine->setObjectName(offers.first()->name());
engine->setIcon(offers.first()->icon());
d->m_engines[name] = engine;
return engine;
}
void DataEngineManager::unloadDataEngine(const QString& name)
{
Plasma::DataEngine* engine = dataEngine(name);
if (engine) {
engine->deref();
if (!engine->isUsed()) {
d->m_engines.remove(name);
delete engine;
}
}
}
QStringList DataEngineManager::knownEngines()
{
QStringList engines;
KService::List offers = KServiceTypeTrader::self()->query("Plasma/DataEngine");
foreach (KService::Ptr service, offers) {
engines.append(service->property("X-EngineName").toString());
}
return engines;
}
} // namespace Plasma